Most GUI interfaces have a button in a menu somewhere that lets a users lock their screens when they are away. But how do you do this on a terminal instead of the usual GUI?
The simple utility is called
vlock. executing it shall bring up a screen like -
This TTY is now locked. Please press [ENTER] to unlock.
Some useful options to use are are
vlock -a -s. The
-a switch prevents the user from witching over to other Virtual Terminals using the
SysRq from killing the process.
The utility may be installed on Mint / Ubuntu based systems by -
sudo apt-get install vlock
Warning! A user may remotely login and kill the vlock process with sudo privileges and unlock the terminal.